CN1261465C - Addition of organic initiators during the pressure drop in vinyl chloride monomer polymerization reactions - Google Patents
Addition of organic initiators during the pressure drop in vinyl chloride monomer polymerization reactions Download PDFInfo
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- CN1261465C CN1261465C CNB028258134A CN02825813A CN1261465C CN 1261465 C CN1261465 C CN 1261465C CN B028258134 A CNB028258134 A CN B028258134A CN 02825813 A CN02825813 A CN 02825813A CN 1261465 C CN1261465 C CN 1261465C
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- pressure drop
- initiator
- pressure
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- vinyl chloride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F14/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
- C08F14/02—Monomers containing chlorine
- C08F14/04—Monomers containing two carbon atoms
- C08F14/06—Vinyl chloride
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/14—Organic medium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/28—Oxygen or compounds releasing free oxygen
- C08F4/32—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/28—Oxygen or compounds releasing free oxygen
- C08F4/32—Organic compounds
- C08F4/38—Mixtures of peroxy-compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F6/00—Post-polymerisation treatments
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Polymerisation Methods In General (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention pertains to a process to polymerize one or more monomers wherein one or more initiators and optionally one or more surfactants are added to a polymerization mixture when the pressure in the polymerization reactor is dropping. This process allows a shorter polymerization time due to a higher pressure drop rate at the end of the polymerization reaction. Moreover, the cooling capacity of the polymerization reactor us used more efficiently.
Description
The present invention relates to a kind ofly wherein use one or more initiator polymerizations to contain one or more monomers and one of them method as the mixture of vinyl chloride monomer (VCM).
Such as is known to persons skilled in the art, this method can be carried out in many different modes.Usually need to shorten the total polymerization time.Finishing the needed time of polyreaction after this can begin to descend by the time of constant voltage in the shortening polymerization reactor or by the pressure of minimizing in reactor realizes.The example that wherein reduces the pressure drop time method is US 5,908,905, has wherein described the method for finishing under the temperature that is higher than the polymeric preset temperature.Yet such temperature raises may cause the polymkeric substance variable color.The most important thing is that it has the shortcoming of the molecular weight of the formed polymkeric substance of influence.
US 5,739, and 222 have described another kind of method, wherein when the internal pressure of reactor descends, other monomer infeeded in the reactor.The physicals of this program meeting remarkably influenced polymer beads.
US 4,015, and 065 has described a kind of method, wherein when pressure drop polymerization starter added in the formed polymkeric substance, simultaneously this polymkeric substance carried out the high-frequency dielectric heating.Adopt this method, purpose is to remove or partly remove the vinyl halide monomer of a large amount of existence from the vinyl halide polymkeric substance.The high-frequency dielectric heating is owing to power consumption and influence the polymer properties of being produced, and as thermostability and color, therefore seldom uses.
The purpose of this invention is to provide a kind of improved method, this method has overcome the shortcoming of art methods.More specifically, the present invention desires to provide a kind of and wherein reduces the total polymerization time method by reducing the pressure drop time.
The inventive method is as the described method of beginning paragraph, and wherein under temperature of reaction one or more initiators are added in polyblends when the pressure in the polymerization reactor descends owing to the consumption of vinyl chloride monomer, condition is that formed polymkeric substance does not carry out high-frequency dielectric and heats in the presence of extra organic initiators.
Between the VCM polymerization period, pressure is directly proportional with the temperature of reaction mixture at first.This is because the pressure in the polymerization reactor mainly is by the vapour pressure decision of VCM in polyblend.When polyreaction will be finished, VCM exhausted.At a time, no longer have liquid VCM phase, and the pressure in the reactor begins to drop to viewed pressure under the temperature that is lower than at that time.After pressure drop and/or during the pressure drop, still have VCM to be present in the gas phase, still, usually increasing VCM is adsorbed onto in the water and polymer phase of reaction mixture.At this moment, rate of polymerization reduce usually and the cooling power of reactor not by optimum utilization.
The contriver now has recognized that these problems, and if find to improve rate of polymerization by adding one or more initiators after pressure drop begins and/or during the pressure drop, then can more effectively utilize the available cooling power of reactor.Add when preferably the pressure of initiator in reactor being descended or after descending.Not too preferably added described initiator at this constantly, because may cause undesirable uncontrolled reaction like this, this uncontrolled reaction is accompanied by undesirable and dangerous pressure and raises.Utilize the cooling power except more effective,, therefore shorten the time that pressure descends in the reactor because higher pressure drop rate makes the total polymerization time decreased.Also improve the reactor space-time yield in addition.
Term " after pressure drop begins and/or during the pressure drop " was meant in the actual observation time that pressure descends in the polymerization reactor before the pressure drop, comprised 30 minutes, preferred 20 minutes, and more preferably 10 minutes, most preferably 5 minutes.Most preferably when being lower than under the uniform temp early stage observed pressure, adds pressure initiator.
Initiator can be any organo-peroxide that is applicable in the polymerization process, for example crosses two carbonic ethers and ethanoyl-cyclohexyl-alkylsulfonyl-superoxide.Therefore, additional initiator can be identical or different with used initiator in the polymerization before the pressure decline.More preferably additional initiator is a fast initiators, for example is 0.0001-1 hour organo-peroxide in half-life.Even more preferably be 0.0001-0.5 hour superoxide in half-life.It most preferably is 0.0001-0.05 hour extremely fast initiator in half-life.
The preferred embodiment of used organo-peroxide was a methoxyacetic acid 1,1,3 in the inventive method, 3-tetramethyl-butyl ester, crossed the methoxyacetic acid tert-butyl ester, crosses the methoxyacetic acid tert-pentyl ester, crossed the ethoxyacetic acid tert-butyl ester, diisobutyryl peroxide (Trigonox
187), peroxidation hexanoyl pivalyl, the different nonanoyl of peroxidation 2-ethyl butyryl, isobutanoyl-lauroyl peroxide, the different nonanoyl of peroxidation isobutyryl, two (t-butyl peroxy) barkite, mistake oxalic acid cyclo-dodecyl tertiary butyl ester, 2; 2-pair-2-ethyl hexanoyl base peroxide-4-methylpentane, 2; 2-pair-2-ethyl butyryl radicals peroxide-4-methylpentane, 2; 2-two (2; 2-dimethyl propylene acyl group peroxide)-and 4-methylpentane, 1-(2-ethyl hexanoyl base peroxide)-1,3-dimethylbutyl-1-peroxide pivalate (Trigonox
267) or 2-cross neodecanoic acid 2,4,4-tri-methyl-amyl ester (Trigonox
423), cross neodecanoic acid tert-pentyl ester (Trigonox
123), cross the neodecanoic acid tert-butyl ester (Trigonox
23), benzene (, to) two (crossing neodecanoic acid 2-sec.-propyls-2-esters), 2-cross neodecanoic acid 2-methyl-4-hydroxyl amyl group ester, cross neodecanoic acid α-cumyl ester (Trigonox
99) and cross two carbonic ethers, for example cross two carbonic acid di-secondary butyl ester (Trigonox
SBP), cross two carbonic acid two (4-tert-butylcyclohexyl) ester (Perkadox
16) and cross two carbonic acid two (2-ethylhexyl) ester (Trigonox
EHP).
Can also use at half-life other organo-peroxide as 0.0001-1 hour.Can determine whether superoxide is fit to and has the required transformation period by Study of Thermal Decomposition conventional in the chlorobenzene, this be well known in the art (for example referring to can from Akzo Nobel to be numbered 10013921001 brochures that obtain " superpolymer initiator ").
Initiator of the present invention can be a redox initiation system.In this case, can be according to the present invention reductive agent, oxygenant or both be infeeded together.For this class redox system, the transformation period of redox system is the transformation period of measuring when all components exists in this system.Yet, consider that redox system contains the fact of heavy metal and/or undesirable reductive agent usually, preferred initiator of the present invention is not this class redox initiation system.
After pressure drop begins and/or during the pressure drop, the initiator amount in the inventive method is arranged within the polymerization process usual range.Usually, based on the monomeric weight of VCM, the following 0.001 weight % that is limited to of the additional initiator of this scope is limited to 0.3 weight % on the 0.005 weight % more preferably, and additional initiator, be preferably 0.2 weight %, most preferably is 0.05 weight %.
With additional initiator with respective pure form or preferably add in the reactor with dilute solution or dispersion (for example suspensoid or emulsion) form.The solvent cut initiator that can use one or more to be fit to.Be easy to remove in the step of preferred this kind solvent aftertreatment polymkeric substance after polymerization process, alcohol for example, perhaps their character of having makes that can accept their stays as the residue in the final polymkeric substance, is the situation of the required softening agent of final resin as solvent.In addition, also may be favourable but not necessarily, this kind solvent can influence the thermostability that is dissolved in initiator wherein sharply, this can verify by the half life temperature of analyzing the initiator in the described solvent.The example of this kind solvent is a Permethyl 99A..If the adding initiator dispersion, then this dispersion can be initiator itself or initiator solution, preferably in above-mentioned suitable solvent.Preferred dispersions is a water dispersion.Preferably with initiator with at least 0.1 weight %, more preferably 0.5 weight %, 2 weight % most preferably, and 75 weight % at the most, more preferably 60 weight % at the most, even more preferably 50 weight % at the most, more preferably 25 weight % still, most preferably the concentration of 15 weight % adds.Rarer initiator solution or dispersion are guaranteed the short mix of initiator and polyblend, and this causes more effectively using initiator, and this is important for the fast initiators that uses.
Interpolation after pressure drop begins and/or during the pressure drop preferably is added on half-life and is less than 1 hour fast initiators, because the initiator of less residual volume will remain in the formed polymkeric substance.In order to reduce residual volume more, preferably be added in the extremely fast superoxide that half-life is less than 0.05 hour.Yet, also can use initiator more at a slow speed.In this case, can preferably be added in the scavenging agent that can neutralize or destroy residual initiators acceptable degree of residual volume of initiator to the polymkeric substance in any later step.When using fast and/or extremely fast during superoxide, also can considering to add scavenging agent.
During the initial part of polyreaction, can use any conventional initiator system.Herein, can with initiator under polymerization temperature intermittently or add in the polyblend continuously.Can be only a collection of disposable with in all initiators adding reactors.In this case, preferably use the transformation period greater than 1 hour initiator more at a slow speed.Initiator also can divide at least 2, and preferably at least 4, more preferably at least 10, most preferably add at least 20 times.
Usually, in polymerization process of the present invention, use one or more protective colloids.The example of the protective colloid that is fit to is the protective colloid such as polyvinyl alcohol (PVA); described polyvinyl alcohol can be that for example degree of hydrolysis is at least 40%; more preferably at least 60%; most preferably be at least 62%; and degree of hydrolysis is at the most 90%; more preferably at the most 85%, most preferably be (part) saponification polyvinyl acetate of 80% at the most.If for example use two kinds of PVA, then these two kinds of PVA can have similar degree of hydrolysis.It is contemplated that also two kinds of PVA have different degree of hydrolysis.Although described PVA is the preferred protective colloid that is used for the inventive method, also can use other GPF (General Protection False colloid, for example cellulosics, water-soluble polymers, oil-soluble emulsifier or water soluble emulsifier.Also it is contemplated that the combination of using two or more above-mentioned protective colloids.Used colloidal consumption and type are known and conventional.Choose wantonly after pressure drop begins and/or also add this class colloid during the pressure drop.If after pressure drop begins and/or during the pressure drop, use, then can be with them with initiator that adds according to the present invention or adding respectively.
Yet, in preferred embodiments, add one or more tensio-active agents after pressure drop begins and/or during the pressure drop.If use with this form, then can be with them with initiator that adds according to the present invention or adding respectively.Because tensio-active agent has reduced foamy in this method (too much) and formed, it is very helpful therefore to find to add tensio-active agent.The example of the tensio-active agent that is fit to is that degree of hydrolysis is lower than 60% polyvinyl acetate and conventional foam reducing composition (defoamer), and this is that those skilled in the art are known usually.Preferably tensio-active agent is added with additional initiator.
Preferably during the constant voltage or after pressure drop and/or during the pressure drop, can add initiator, optional colloid and optional tensio-active agent at any suitable reactor inlet.Such inlet can be arranged on as required under the reaction mixture surface or on.Can these compounds be added in the reactor respectively via independent inlet, or enter in the reactor, maybe can use the combination of these technology with their premixs and via an inlet.If in polymerization process, add entry for example to compensate the contraction of the reactor content that causes owing to polyreaction, then can advantageously utilize pipeline interpolation initiator and/or optional protective colloid and/or the tensio-active agent that is used to add water.Also can imagine reactor and comprise pipe special system and a plurality of inlet that is positioned at the different positions of described reactor periphery, so as to guarantee in reaction mixture better, faster and mixed initiator, protective colloid and/or tensio-active agent more equably.If reactor further comprises reflux exchanger, then can consider these compounds are added in the reaction mixture via reflux exchanger.
The inventive method relates to the monomer mixture of aggregate packet vinyl-chloride-containing monomer (VCM).Preferred the inventive method relates to polymerization and comprises based on all monomeric weight and be at least 5 weight %VCM, preferably at least 10 weight %, more preferably at least 20 weight %, the most preferably monomer mixture of at least 50 weight %VCM.Operable comonomer is the general type monomer, and comprises vinylidene chloride, vinyl-acetic ester, ethene, propylene, vinyl cyanide, vinylbenzene and (methyl) acrylate.More preferably the monomer that is aggregated of at least 80 weight % is made up of VCM, and in most preferred method, this monomer mainly is made up of VCM.As known in the art, the polymerization temperature of these class methods has determined the molecular weight of gained resin largely.
Polymerization process can mainly be monomeric bulk process by reaction mixture wherein, or by the preferred wherein reaction mixture suspension process of the suspension of monomer in water normally, or by wherein usually monomer emulsive emulsion or microemulsion method in water being carried out.In these methods, must use additive commonly used.For example, if monomer is present in the water with form of suspension, then can there be additive commonly used such as image surface promoting agent, stain control agent, pH-buffer reagent.The type that depends on required polymkeric substance, preferably each in the aforesaid method.The inventive method is particularly suited for using with suspension process.
After polymerization, usual manner aftertreatment gained (being total to) polymkeric substance (or resin) that can this area.For example, the polymkeric substance that will obtain by suspension polymerization according to the present invention carries out conventional drying and screening step.Because this resinoid is used Metrastat according to ISO 182-2 (1990E)
The excellent heat stability of PSD260 test furnace mensuration, after therefore and then drying was also screened in 1 hour under 60 ℃, the gained resin preferably contained and is less than the 50ppm residual initiators, more preferably less than 40ppm, most preferably is less than the 25ppm initiator.Improved thermostability confirms that when carrying out the melt-processed step for example with the formation moulded products, resin is variable color hardly.Therefore, this method can comprise the processing step of extra decomposing excessive initiator.Preferred described processing step is after polyreaction finishes and carry out before the dry resin.
The embodiment of the beyond thought effect of quick superoxide is added in explanation during pressure drop in PVC suspension polymerization:
Experiment
In standard suspension polymerization experiment, with 425g softening water, Alcotex B72 (1000ppm, based on VCM) 5 weight % solution in softening water add in 1 liter of stainless steel B ü chi reactor of the controlled temperature that a baffle plate, three blade agitators, pressure transmitter, VCM feeding line and nitrogen purge line are housed, and use nitrogen that reactor is forced into 15 crust gauge pressures.Leak if observe not have, then reactor is vacuumized and uses nitrogen pressure to 5 crust gauge pressure three times, to flush out all air basically.Next reactor is vacuumized and add ﹠amp available from Akzo Nobel Salt; Among the 250g VCM of Basics, in 30-60 minute, reactor is heated to polymeric reaction temperature subsequently.Add the conventional superoxide that is used for initiated polymerization by hot startup procedure, as Trigonox
EHP (TxEHP).Hot startup procedure was meant in the very short time, under polymerization temperature superoxide was added in the reactor in promptly 1-5 minute.
During the polymeric pressure drop, will be less than 0.1 hour fast initiators in half-life and add in the reactor, 3.5 crust that descended of the pressure in reactor.In order to add (extra) fast initiators, use the emulsion of low concentration (about 1 weight %).In Comparative Examples, save interpolation (extra) fast initiators.
After the pressure drop that reaches above-mentioned 3.5 crust, stop to infeed superoxide.Then with reactor cooling to 20-25 ℃, vacuumize and remove basically all remaining VCM.After filtration, washing and the drying (using fluidized-bed), obtain polymkeric substance in carrying out under 60 ℃ 1 hour.
Embodiment 1
Used initiator (be dissolved in Tx EHP (75 weight %) and Tx187[0.3 weight % water miscible liquid in the Permethyl 99A. (25 weight %)]), the amount of infeeding, infeed program and polymerization result is listed in the table 1.
After reaching polymerization temperature, in 1-5 minute, add the Tx EHP (in VCM) in the Permethyl 99A. of being dissolved in of described amount.
Table 1: during pressure drop, do not add (Comparative Examples) and add (embodiment 1)
Diisobutyryl peroxide (Tx 187) used two carbonic acid two under 57 ℃
The result of the VCM suspension polymerization of (2-ethylhexyl) ester (Tx EHP)
| Embodiment 1 | Comparative Examples | |
| Warm start superoxide and consumption | 800ppm Tx EHP | 800ppm Tx EHP |
| During pressure drop, add superoxide | In 30 minutes, add 80ppm Tx 187 | Do not have |
| Constant voltage time | 182 minutes | 180 minutes |
| Pressure drop rate | 7 crust/hour | 4 crust/hour |
| Polymerization time when reactor pressure descends 3.5 crust gauge pressures | 210 minutes | 230 minutes |
| The PVC productive rate | 91％ | 87％ |
By table 1 as seen, compare with the ordinary method of Comparative Examples, the method for embodiment 1 has significantly higher pressure drop rate significantly.This higher pressure drop rate causes short polymerization time.This higher pressure drop rate obviously helps to utilize better the cooling power of reactor.
Claims (5)
1. one kind is wherein used one or more initiator polymerizations to contain one or more monomers and one of them method as the mixture of vinyl chloride monomer, wherein the first part in polyreaction adds the normal starter system in the polyblend, and extra initiator adds in the polyblend with one or more under temperature of reaction when the pressure in the polymerization reactor descends owing to the consumption of vinyl chloride monomer, the described extra transformation period of initiator under polymerization temperature is less than 1 hour, and condition is that formed polymkeric substance does not carry out the high-frequency dielectric heating in the presence of extra organic initiators.
2. according to the process of claim 1 wherein after pressure drop begins and/or the transformation period of the initiator that is added during the pressure drop under polymerization temperature is 0.0001-1 hour.
3. according to the method for claim 2, the transformation period of extra organic initiators under polymerization temperature that is wherein added after pressure drop and/or during the pressure drop is 0.0001-0.05 hour.
4. according to each method of claim 1-3, wherein after pressure drop begins and/or during the pressure drop intermittently or be added to the small part initiator continuously.
5. according to each method of claim 1-3, wherein when the pressure in the polymerization reactor descends owing to the consumption of vinyl chloride monomer, also add tensio-active agent and form to reduce foam.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US34243401P | 2001-12-21 | 2001-12-21 | |
| US60/342,434 | 2001-12-21 | ||
| EP02077471.7 | 2002-06-18 | ||
| EP02077471A EP1375529A1 (en) | 2002-06-18 | 2002-06-18 | Addition of organic initiators during a pressure drop in vinyl chloride monomer polymerization reactions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1606575A CN1606575A (en) | 2005-04-13 |
| CN1261465C true CN1261465C (en) | 2006-06-28 |
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ID=26077603
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB028258134A Expired - Lifetime CN1261465C (en) | 2001-12-21 | 2002-12-17 | Addition of organic initiators during the pressure drop in vinyl chloride monomer polymerization reactions |
Country Status (23)
| Country | Link |
|---|---|
| US (2) | US20050080207A1 (en) |
| EP (1) | EP1456257B2 (en) |
| JP (1) | JP4571804B2 (en) |
| KR (1) | KR100932452B1 (en) |
| CN (1) | CN1261465C (en) |
| AR (1) | AR037954A1 (en) |
| AT (1) | ATE434632T1 (en) |
| AU (1) | AU2002361137B2 (en) |
| BR (1) | BR0215239B1 (en) |
| CA (1) | CA2470817C (en) |
| CO (1) | CO5590964A2 (en) |
| DE (1) | DE60232743D1 (en) |
| ES (1) | ES2328122T5 (en) |
| HU (1) | HU230963B1 (en) |
| IL (1) | IL162621A0 (en) |
| MX (1) | MXPA04006038A (en) |
| MY (1) | MY139215A (en) |
| NO (1) | NO344005B1 (en) |
| PL (1) | PL207290B1 (en) |
| RU (1) | RU2288233C2 (en) |
| TW (1) | TWI270553B (en) |
| WO (1) | WO2003054039A1 (en) |
| ZA (1) | ZA200405783B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| UA77245C2 (en) * | 2001-12-21 | 2006-11-15 | Акцо Нобель Н.В. | Process for polymerization of mixture containing vinylchloride monomer |
| TW200424217A (en) * | 2003-05-01 | 2004-11-16 | Akzo Nobel Nv | Increased polymerization reactor output by using a specific initiating system |
| ATE380199T1 (en) | 2003-06-20 | 2007-12-15 | Akzo Nobel Nv | POLYMERIZATION PROCESS WITH DOSAGE OF INITIATORS |
| US7112637B2 (en) * | 2003-12-26 | 2006-09-26 | Shin-Etsu Chemical Co., Ltd. | Process for producing vinyl chloride polymer |
| PL2462114T3 (en) | 2009-08-06 | 2014-07-31 | Akzo Nobel Chemicals Int Bv | Storage stable and safe peroxide emulsions with a high active oxygen content |
| KR101303515B1 (en) | 2010-03-03 | 2013-09-03 | 주식회사 엘지화학 | A method of suspension polymerization for vinyl chlorides resin having good polymerization productivity |
| AR081664A1 (en) | 2010-06-30 | 2012-10-10 | Akzo Nobel Chemicals Int Bv | POLYMERIZATION PROCESS WITH IN-SITU INITIATOR TRAINING |
Family Cites Families (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE247805C (en) | ||||
| US3325453A (en) * | 1963-10-11 | 1967-06-13 | Ceskoslovenska Akademie Ved | Polymerization method wherein the rate of initiator addition is dependent on the reaction temperature |
| US3451985A (en) * | 1964-03-26 | 1969-06-24 | Monsanto Co | Method of polymerizing vinyl monomers |
| FR2133113A5 (en) * | 1971-04-08 | 1972-11-24 | Rhone Progil | |
| CA984548A (en) * | 1972-09-05 | 1976-02-24 | Hans Walser | Method of improving heat stability of emulsion polymerized polyvinyl chloride |
| GB1489866A (en) * | 1973-12-26 | 1977-10-26 | Bp Chem Int Ltd | Polymerisation process |
| US4015065A (en) * | 1974-05-17 | 1977-03-29 | The British Petroleum Company Limited | Treatment of vinyl halide polymers |
| US4193890A (en) * | 1977-04-06 | 1980-03-18 | Tenneco Chemicals, Inc. | Color stabilizers for vinyl chloride resins |
| NZ204248A (en) * | 1982-06-01 | 1985-04-30 | Ici Australia Ltd | Production of vinyl chloride polymer |
| NO166329C (en) * | 1986-01-22 | 1991-07-03 | Atochem | VINYL CHLORIDE COPOLYMES AND THEIR PREPARATION. |
| JPH07119247B2 (en) | 1987-12-28 | 1995-12-20 | 日本ゼオン株式会社 | Method for producing vinyl chloride polymer |
| JPH0411606A (en) * | 1990-05-01 | 1992-01-16 | Shin Etsu Chem Co Ltd | Production of vinyl chloride polymer |
| JPH0782304A (en) * | 1993-09-13 | 1995-03-28 | Shin Etsu Chem Co Ltd | Production of vinyl chloride polymer |
| US5739222A (en) * | 1995-07-05 | 1998-04-14 | Shin-Etsu Chemical Co., Ltd. | Process for preparing vinyl chloride polymer under specified vapor pressure |
| JP3317830B2 (en) * | 1995-11-22 | 2002-08-26 | 信越化学工業株式会社 | Method for producing vinyl chloride polymer |
| JPH11106408A (en) * | 1997-04-01 | 1999-04-20 | Sekisui Chem Co Ltd | Suspension polymerization of vinyl chloride-based monomer |
| DE69938605T2 (en) * | 1998-09-21 | 2009-05-28 | Akzo Nobel N.V. | CONTINUOUS DOSAGE OF VERY FAST INITIATORS DURING POLYMERIZATION REACTIONS |
| JP2000230018A (en) * | 1999-02-08 | 2000-08-22 | Mitsui Chemicals Inc | Manufacture of vinyl chloride resin |
| RU2178799C2 (en) | 1999-06-09 | 2002-01-27 | ОАО "Капролактам" | Method of preparing suspension polyvinyl chloride |
| EP1375529A1 (en) | 2002-06-18 | 2004-01-02 | Akzo Nobel N.V. | Addition of organic initiators during a pressure drop in vinyl chloride monomer polymerization reactions |
| UA77245C2 (en) * | 2001-12-21 | 2006-11-15 | Акцо Нобель Н.В. | Process for polymerization of mixture containing vinylchloride monomer |
| DE10210195B4 (en) † | 2002-03-07 | 2005-12-15 | Schwarz Pharma Ag | Use of 1,3-diazaspiro [4,5] decane-2,4-dithione for the treatment of pain |
| DE60307255T2 (en) * | 2002-04-12 | 2007-08-30 | Akzo Nobel N.V. | CO-DOSING OF ORGANIC INITIATORS AND PROTECTION COLLOIDS DURING POLYMERIZATION REACTIONS |
-
2002
- 2002-12-17 CN CNB028258134A patent/CN1261465C/en not_active Expired - Lifetime
- 2002-12-17 KR KR1020047009743A patent/KR100932452B1/en active IP Right Grant
- 2002-12-17 MX MXPA04006038A patent/MXPA04006038A/en active IP Right Grant
- 2002-12-17 IL IL16262102A patent/IL162621A0/en unknown
- 2002-12-17 JP JP2003554752A patent/JP4571804B2/en not_active Expired - Lifetime
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